Find suitable mid point

2017 9 7
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更新时间：2017 9 7
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this is my code
%%%%%%%%%%%%%%%%%%%%%%%%%
clear all;
[filename pathname]=uigetfile('*.jpg;*.png;*.tif;*.tiff;*.gif;*.bmp;');
inputimage=imread([pathname filename]);
I=inputimage;
I = rgb2gray(I) ;
[y,x] = find(I) ;
figure
imshow(I)
hold on
plot(x,y,'.b')
plot(x(1),y(1),'*y')
plot(x(end),y(end),'*r')
line([x(1),0],[y(1), 0])
line([x(end),0],[y(end), 0])
figure(1);line([0 1],[0 1]);
%%%%%%%%%%%%%%%%%%%%%%
i wana to find the mid point between the yellow point and red point.... the mid poit is that point where the curve become bended........... as shown the point by arrow...
orignal image
ofter code

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